Received: 11 September 2017
Accepted: 16 February 2018
First Online: 23 February 2018
Ethics approval and consent to participate
: The study was approved as a nonhuman-subject, quality-improvement study by the Netcare research operations committee and the approval waived by the University of Stellenbosch ethics committee.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.